[U-Boot] [PATCH 13/24] mxc_i2c: check for arbitration lost

[Troy Kisky]

No need to continue waiting if arbitration lost.

Signed-off-by: Troy Kisky <troy.kisky at boundarydevices.com>
---
 drivers/i2c/mxc_i2c.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index 2bff2b8..df033ea 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -54,6 +54,7 @@ struct mxc_i2c_regs {
 
 #define I2SR_ICF	(1 << 7)
 #define I2SR_IBB	(1 << 5)
+#define I2SR_IAL	(1 << 4)
 #define I2SR_IIF	(1 << 1)
 #define I2SR_RX_NO_AK	(1 << 0)
 
@@ -164,6 +165,12 @@ static unsigned wait_for_sr_state(struct mxc_i2c_regs *i2c_regs, unsigned state)
 	ulong start_time = get_timer(0);
 	for (;;) {
 		sr = readb(&i2c_regs->i2sr);
+		if (sr & I2SR_IAL) {
+			writeb(sr & ~I2SR_IAL, &i2c_regs->i2sr);
+			printf("%s: Arbitration lost sr=%x cr=%x state=%x\n",
+				__func__, sr, readb(&i2c_regs->i2cr), state);
+			return -ERESTART;
+		}
 		if ((sr & (state >> 8)) == (unsigned char)state)
 			return sr;
 		elapsed = get_timer(start_time);
-- 
1.7.9.5